I wouldn't be surprised if it was hand-lettered. Film or process lettering is another possibility. I've checked specimen books for Photo-Lettering, Filmotype, and Lettering Inc. All of them had similar styles, but unfortunately none matches exactly.

(Coincidentally, the closest match from Filmotype, "Escort", is being digitized and will probably be released soon. I'm not the one working on it and not involved in release schedules, so I don't know exactly how soon.)